Abstract
The effect of multiple reflowing processes on interfacial reactions and mechanical properties of the Sn-9.0 wt.%Zn (SZ)/Ag and Sn-3.0 wt.%Ag-0.5 wt.%Cu (SAC)/Ag couples was investigated in this study. The SZ/Ag and SAC/Ag couples were reflowed at 240°C for 10 min in one up to five times. After reflowing, all couples were quenched in icy water and air-cooling conditions. The experimental results revealed that the AgZn3, Ag5Zn8, and AgZn phases were formed in the SZ/Ag couple. The thin AgZn3 layer was observed when the SZ/Ag couple was quenched in icy water. When the number of reflows was increased, a rod-shaped Zn phase gradually became a fine needle-shaped Zn phase. Only the Ag3Sn phase was formed in the SAC/Ag couple. The growth mechanism of the intermetallic compound was diffusion-controlled in both reaction couples. A brittle fracture was observed in the SZ/Ag solder joint. The fracture surface showed the ductile and slightly brittle failure in the SAC/Ag solder joint.
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Acknowledgments
The authors acknowledge financial support from the Ministry of Science and Technology, Taiwan, ROC. (Grant No. MOST 104-2628-E-011-001-MY3); the Applied Research Center for Thin-Film Metallic Glass; and The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) in Taiwan. The author is also thankful for the help of Mr. S. C. Laiw who works at the National Taiwan University of Science and Technology for SEM–EDS operation.
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Liu, CY., Kuo, PC., Chen, CM. et al. Effect of Multiple Reflowing Processes on Interfacial Reactions and Mechanical Properties between Sn-9.0 wt.%Zn, Sn-3.0 wt.%Ag-0.5 wt.%Cu Solders and Ag Substrate. J. Electron. Mater. 49, 257–267 (2020). https://doi.org/10.1007/s11664-019-07752-z
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DOI: https://doi.org/10.1007/s11664-019-07752-z